Mongoose model

appmodel.js

require('dotenv').config();

// TODO move to singleton pattern
const mongoose = require("mongoose")

mongoose.connect(process.env.MONGO_URI, { useNewUrlParser: true, useUnifiedTopology: true }, (err)=> {
  console.log("DB Error", err)
});


const personSchema = new mongoose.Schema({
  name: {
      type: String,
      required: true, 
  }, 
  age: Number,
  favoriteFoods: [String]
})

const Person = mongoose.model("Person", personSchema)
const person = Person({
  name: "veer",
  age: 30, 
  favoriteFoods: ["Vada Sambhar "]
})

const createAndSavePerson = (done) => {
  person.save(function(err, data) {
    if(err){
      console.log(err)
    }
    done(null, data)
  });
  
};

const createManyPeople = (arrayOfPeople, done) => {
  Person.insertMany(arrayOfPeople).then(data => {
    done(null, data);
  }).catch(err => {
    console.log(err)
  })
  
};

const findPeopleByName = (personName, done) => {
  Person.find({
    name: personName
  }).then(data => {
    done(null, data)
  }).catch(err => {
    console.log(err)
  })
};

const findOneByFood = (food, done) => {
  Person.findOne({
    favoriteFoods: food
  }).then(data => {
    done(null, data)
  }).catch(err => {
    console.log(err)
  })
};

const findPersonById = (personId, done) => {
  Person.findById({
    _id: personId
  }).then(data => {
    done(null, data)
  }).catch(err => {
    console.log(err)
  })
};

const findEditThenSave = (personId, done) => {
  const foodToAdd = "hamburger";
  Person.findById({
    _id: personId
  }).then(data => {
    data["favoriteFoods"] = [...data["favoriteFoods"], foodToAdd]
    data.save((err, data) => {
      if(err){
        console.log(err)
      }
      done(null, data)

    })
    console.log(data)
  }).catch(err => {
    console.log(err)
  })
};

const findAndUpdate = (personName, done) => {
  const ageToSet = 20;
  Person.findOneAndUpdate({
      name: personName
    }, 
    {
      age: ageToSet
    },
    {
      new: true
    }
  ).then(data => {
    done(null, data);
  }).catch(err => {
    console.log(err)
  })
};

const removeById = (personId, done) => {
  Person.findOneAndRemove({
    _id: personId
  }
  ).then(data => {
    done(null, data);
  }).catch(err => {
    console.log(err)
  })
};

const removeManyPeople = (done) => {
  const nameToRemove = "Mary";
  Person.remove({
    name: nameToRemove
  }, (err, res) => {
    if(err) console.log(err)
    done(null, res);
  })

  
};

const queryChain = (done) => {
  const foodToSearch = "burrito";
  Person.find({
    favoriteFoods: foodToSearch
  }).sort({
    name: 1
  }).limit(2)
  .select({
    age: false
  }).exec().then(data => {
    done(null, data);
  }).catch(err => {
    console.log(err)
  })

  
};

/** **Well Done !!**
/* You completed these challenges, let's go celebrate !
 */

//----- **DO NOT EDIT BELOW THIS LINE** ----------------------------------

exports.PersonModel = Person;
exports.createAndSavePerson = createAndSavePerson;
exports.findPeopleByName = findPeopleByName;
exports.findOneByFood = findOneByFood;
exports.findPersonById = findPersonById;
exports.findEditThenSave = findEditThenSave;
exports.findAndUpdate = findAndUpdate;
exports.createManyPeople = createManyPeople;
exports.removeById = removeById;
exports.removeManyPeople = removeManyPeople;
exports.queryChain = queryChain;